Buffalo overcharges

Shein needs to drop Buffalo as shipper. Not even a month ago I only paid 80 for customs for a shipment of 600 now it is over 500 for a shipment of 1600. Orders for shein from south africa will be dropping due to this and they will lose revenue. I don't know what is going on there it is not like customs prices suddenly changed in the last month yet they want to charge exorbitant amounts of cash or hold your shipment hostage. Ridiculous